Which country has the longest combined land border?

Russia
United States
Brazil
China
China's combined land border measures 22,117 km (13,743 mi) from the mouth of the Yalu River to the Gulf of Tonkin. China borders 14 nations, more than any other country except Russia, which also borders 14.
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Answers by country

Russia
United States
Brazil
China
answers
flagIndia
30%
24%
0%
45%
33
flagthe United Kingdom
46%
18%
4%
30%
82
flagGermany
52%
20%
0%
28%
25
flagPoland
54%
11%
6%
27%
12604
flagUnknown
50%
15%
7%
26%
26
flagAustralia
41%
25%
0%
25%
12
flagthe Netherlands
40%
20%
20%
20%
10
flagthe United States
52%
22%
5%
18%
178
flagGreece
35%
47%
0%
17%
17
flagItaly
78%
7%
0%
14%
14